US5121822A - Centrifugal clutch - Google Patents
Centrifugal clutch Download PDFInfo
- Publication number
- US5121822A US5121822A US07/720,636 US72063691A US5121822A US 5121822 A US5121822 A US 5121822A US 72063691 A US72063691 A US 72063691A US 5121822 A US5121822 A US 5121822A
- Authority
- US
- United States
- Prior art keywords
- jaws
- coupling
- pressure device
- centrifugal clutch
- elastic pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D43/00—Automatic clutches
- F16D43/02—Automatic clutches actuated entirely mechanically
- F16D43/04—Automatic clutches actuated entirely mechanically controlled by angular speed
- F16D43/14—Automatic clutches actuated entirely mechanically controlled by angular speed with centrifugal masses actuating the clutching members directly in a direction which has at least a radial component; with centrifugal masses themselves being the clutching members
- F16D43/18—Automatic clutches actuated entirely mechanically controlled by angular speed with centrifugal masses actuating the clutching members directly in a direction which has at least a radial component; with centrifugal masses themselves being the clutching members with friction clutching members
Definitions
- the present invention relates to a centrifugal clutch between a driving and a driven axle to be used in e.g. a chain saw.
- a centrifugal clutch includes a coupling drum, jaws put into a coupling center and springs holding the jaws elastically in a disconneted position when the coupling is non-operating.
- the springs of the centrifugal clutches consist of tension springs actuating the jaws towards the center so that the drum is kept free from the coupling center.
- the ends of the tension springs are fastened to the jaws and to the coupling center, which ends then are exposed to hard stress and therefore might break.
- a broken spring causes the coupling to not function as intended, e.g. the property of engagement at a determined r.p.m. will disappear.
- FIG. 1 a centrifugal clutch according to the invention in upright projection
- FIG. 2 a spoke plate to the coupling center in the coupling
- FIG. 3 a section through a spoke in the coupling center.
- FIG. 1 The two main parts of the centrifugal clutch, the coupling drum 11 and the coupling center 12, are shown in FIG. 1, the drum in the shape of a bowl in the bottom of which (hidden in FIG. 1) a hole for a shaft has been made, which shaft will be driven by the clutch.
- the center consists of a rotor which drives, when rotating, the drum thanks to the jaws 13 in the center. When rotating the jaws are exposed to a centrifugal force lifting out each jaw towards the drum so that they make contact with the inside of the drum.
- the jaws are held in place between a couple of spoke plates 14, 15 (FIGS. 2 and 3), spokes 16, 17 of which show rectangular recesses 18, 19.
- spokes 16, 17 of which show rectangular recesses 18, 19.
- recesses 20 In the jaws there are also such recesses 20 that coincide with those of the spokes (FIG. 3).
- a pressure spring 21 which presses against a short side 22 of the recess in the jaw and also against a supporting bridge 23 at the end of the recesses of the spokes 18, 19.
- the other short ends 24 of those recesses rests against the exterior sides of the supporting bridges.
- the jaws then show a small play 25 in relation to the inside of the drum which is thus disconnected from the coupling center.
- the spokes have also supporting edges 26, 27 for the jaws which are provided with ribs 28, 29 that make contact against thoses edges.
- a rotation power can be transmitted from the spoke to the jaw in the direction shown by the arrow 30.
- the power is transmitted to the drum when the jaws are pressed out towards the drum by centrifugal force.
- the jaw is moved through the little play 25 along a line 31 constituting an angle v against the radius r. Thanks to this angle a certain wedge action arises at the jaw between the spoke plate and the drum, and this action strengthens the friction against the drum and increases thereby the transferable power in the coupling.
- the shaping of the recesses can be adapted to the choice of spring type.
- the helical pressure spring illustrated in the drawing is such a choice.
- Other shapes are conic, concave or convex coiling dependent on what characteristics the coupling should have with regard to the engaging r.p.m. and the transmitted power as well as the size of the available spacing.
- Diaphragm springs in a pack are also a possibility.
- the recess in the spoke plate can be made large enough to allow the spring to be inserted through the recess hole.
- a knob 32 is used on the short side 22 of the recess in the jaw.
- the spring is held in place through the fact that the recesses in the spoke plates have a smaller width than the diameter of the spring in the area next to the position of the supporting bridges.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
- Springs (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9002690 | 1990-08-20 | ||
SE9002690A SE500271C2 (en) | 1990-08-20 | 1990-08-20 | Centrifugal |
Publications (1)
Publication Number | Publication Date |
---|---|
US5121822A true US5121822A (en) | 1992-06-16 |
Family
ID=20380181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/720,636 Expired - Fee Related US5121822A (en) | 1990-08-20 | 1991-06-25 | Centrifugal clutch |
Country Status (5)
Country | Link |
---|---|
US (1) | US5121822A (en) |
JP (1) | JPH05141451A (en) |
DE (1) | DE4127540C2 (en) |
IT (1) | IT1253691B (en) |
SE (1) | SE500271C2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6309317B1 (en) | 1998-01-28 | 2001-10-30 | Robert Joss | Centrifugal clutch shifter |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ286916B6 (en) | 1998-12-23 | 2000-08-16 | Pavel Blata | Centrifugal friction clutch |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2022071A (en) * | 1931-11-20 | 1935-11-26 | William C Starkey | Freewheeling mechanism for automobiles |
US2778469A (en) * | 1951-09-19 | 1957-01-22 | Morse Chain Co | Centrifugal clutch |
US3367465A (en) * | 1966-01-10 | 1968-02-06 | Textron Inc | Centrifugal clutch |
US3610382A (en) * | 1969-10-27 | 1971-10-05 | Scott & Fetzer Co | Centrifugal clutch |
US3696901A (en) * | 1970-10-30 | 1972-10-10 | Mcculloch Corp | Centrifugal clutch |
US3938633A (en) * | 1972-02-02 | 1976-02-17 | Andreas Stihl Maschinenfabrik | Motor chain saw |
JPS61140625A (en) * | 1984-12-13 | 1986-06-27 | Fuji Robin Ind Ltd | Transmission connecting-disconnecting device in centrifugal clutch |
US4832165A (en) * | 1986-08-25 | 1989-05-23 | Kabushiki Kaisha Daikin Seisakusho | Clutch brake |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2000713A (en) * | 1929-05-10 | 1935-05-07 | Gen Electric | Clutch |
US2947399A (en) * | 1957-07-29 | 1960-08-02 | Mcculloch Corp | Centrifugally actuated friction clutch |
DE1951004U (en) * | 1966-09-23 | 1966-12-01 | Zuendapp Werke G M B H | Centrifugal clutch for single-track vehicles. |
US3477555A (en) * | 1968-01-30 | 1969-11-11 | Mcculloch Corp | Centrifugal friction clutch |
US3768611A (en) * | 1972-03-28 | 1973-10-30 | Mc Culloch Corp | Centrifugal clutch with c-springs |
-
1990
- 1990-08-20 SE SE9002690A patent/SE500271C2/en unknown
-
1991
- 1991-06-25 US US07/720,636 patent/US5121822A/en not_active Expired - Fee Related
- 1991-07-12 IT ITPN910045A patent/IT1253691B/en active IP Right Grant
- 1991-08-20 DE DE4127540A patent/DE4127540C2/en not_active Expired - Fee Related
- 1991-08-20 JP JP3207901A patent/JPH05141451A/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2022071A (en) * | 1931-11-20 | 1935-11-26 | William C Starkey | Freewheeling mechanism for automobiles |
US2778469A (en) * | 1951-09-19 | 1957-01-22 | Morse Chain Co | Centrifugal clutch |
US3367465A (en) * | 1966-01-10 | 1968-02-06 | Textron Inc | Centrifugal clutch |
US3610382A (en) * | 1969-10-27 | 1971-10-05 | Scott & Fetzer Co | Centrifugal clutch |
US3696901A (en) * | 1970-10-30 | 1972-10-10 | Mcculloch Corp | Centrifugal clutch |
US3938633A (en) * | 1972-02-02 | 1976-02-17 | Andreas Stihl Maschinenfabrik | Motor chain saw |
JPS61140625A (en) * | 1984-12-13 | 1986-06-27 | Fuji Robin Ind Ltd | Transmission connecting-disconnecting device in centrifugal clutch |
US4832165A (en) * | 1986-08-25 | 1989-05-23 | Kabushiki Kaisha Daikin Seisakusho | Clutch brake |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6309317B1 (en) | 1998-01-28 | 2001-10-30 | Robert Joss | Centrifugal clutch shifter |
Also Published As
Publication number | Publication date |
---|---|
IT1253691B (en) | 1995-08-22 |
JPH05141451A (en) | 1993-06-08 |
SE500271C2 (en) | 1994-05-24 |
SE9002690L (en) | 1992-02-21 |
DE4127540C2 (en) | 1994-06-23 |
SE9002690D0 (en) | 1990-08-20 |
DE4127540A1 (en) | 1992-03-05 |
ITPN910045A1 (en) | 1993-01-12 |
ITPN910045A0 (en) | 1991-07-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AKTIEBOLAGET ELECTROLUX Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EDLUND, DAG H.;REEL/FRAME:005752/0073 Effective date: 19910607 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20000616 |
|
AS | Assignment |
Owner name: HUSQVARNA AB, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AB ELECTROLUX;REEL/FRAME:019181/0616 Effective date: 20061221 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |